Hinge-mortising machine.



PATENTED SEPT. 20, 1904.

. J. W. CARSON.

HINGE M-ORTISING MACHINE.

APPLICATION PILED JULY a1, 1903.

no MODE-L.

lz77zes74/6a719072 Patented September 20, 1904.

UNTTEE STATES PATENT @EETEE.

JAMES W. CARSON, OF RIOHBURG, NORTH DAKOTA.

HINGE-MORTISING MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 770,261, datedSeptember 20, 1904. Application filed July 31, 1903. Serial No. 167,787-(No model.)

To all whom itmay concern.-

Beit known that I, J AMES W. CARsoN, a citizen of the United States,residing at Richburg, in the county of Bottineau and State of NorthDakota, have invented a new and useful Hinge- Mortising Machine, ofwhich the following is a specification.

This invention relates to hinge-mortisers.

The object of the invention is to provide a hinge-mortiser of simpleconstruction, which is adapted to withstand the strain of constant useand which is adapted to facilitate the cutting of hinge-mortises at amore rapid rate than the hinge-mortisers now in general use.

A special object of the invention is to provide a hinge-mortiser of suchconstruction that the cutting of the mortises may be accomplished withvery few blows of the mallet and which is adapted for use by unskilledpersons with the production of mortises of uniform dimensions and neatappearance.

With the objects above stated and others in view my invention consistsin the construction and combination of parts of a hinge-mortiserhereinafter fully described and claimed, and shown in the accompanyingdrawings, forming part of this specification, it being understood thatvarious changes in the form, proportions, and exact mode of assemblageof the elements therein exhibited may be made without departing from thespirit of the invention or sacrificing any of its advantages.

In the drawings, Figure 1 is a view in perspective of the hinge-mortiserwith the chipremoving chisel removed from its seat to show theconstruction of the seat. Fig. 2 is a view in vertical section throughthe hingemortiser, showing the same in operative relation to the edge ofa block upon which it is desired to form a mortise. Fig. 3 is a detailview in perspective from below of the cut tor-head removed from thebase-plate.

Referring in detail to the drawings, in which corresponding parts aredesignated by the same characters of reference throughout, 1 designatesthe base plate or block of the hingemortiser, provided near one marginwith an oblong rectangular opening 2 for the vertical reciprocation ofthe cutter-head 3 and having adjacent to the ends thereof. transverseslots 4 for the passage of adj Listing-screws 5, which extend into agage-bar 6, which may be secured positively in any suitable relation tothe base-plate 1 by means of the screws 5.

The cutter-head 3 consists of a block 7, provided on top with anupwardly-projecting head or stem 8 and having on the under side thereofa plurality of transversely-arranged chisels 9, arranged atapproximately equal distances apart, as shown, and having the inclinedfaces thereof disposed toward the middle of the cutter-head. On threesides of the block 8 are secured in any suitable manner thin blades 1011 12 for defining the ends and sides of a hinge-mortise, as will behereinafter explained. The block 7 with the chisels 9 and the blades 1011 12 form a mass of such size that it will just move freely up and downin the opening 2 in the base-plate. In order to prevent the chisels andthe blades at the margin of the block from cutting too deeply, there areprovided at the ends of the block the two stops 13, which are of suchdimensions that they contact with the upper surface of the base-plate land prevent any further downward movement of the cutterhead 3 after themortise has been cut to the desired depth at the periphery and the chipto be removed has been divided by the blades 9 into small and easilyremovable portions.

The gage-bar 6 is adjustable transversely of the base-plate 1 by meansof screws 5, as already explained, and when it is desired to use themortiser to cut mortises of any desired size the width of the mortise tobe cut will be determined by setting the gage-bar at the de sired pointand securing it there by means of the screws 5.

In order to facilitate the removal of the chip after the cutter-head hasbeen driven downward far enough to form the marginal cuts of themortise, there is mounted in ways formed on the guide-bar 6 by cuttingaway a suitable portion of its upper surface a broadbladed chisel 14L,which lies in a plane at right angles to the plane of movement of thecutterhead 3 and is adapted for the ready removal of the chips formed bythe operation of the cutter-head.

In using the hinge-mortiser the size of the usual dimensions, no

few blows upon the broad-bladed chisel 14 1 and width, means for varyingthe depth of mortise to be cut will be determined at first and then thegage-bar will be set so that when the device is placed upon thedoor-jamb or upon the margin of the door itself and the gage-bar isseated against the edge thereof the cutterhead will be .in properposition for forming the outline of the mortise and breaking up the chiptherein. This will be done by striking upon the upper end of the stem 8with a mallet or similar implement. No particular care is required inthis operation, as the clownward movement of the cutter-head ispositively limited by the blocks on the ends thereof, and when theblades on the under side of thecutter-head have reached their full depththe stops at the ends of the block will contact with the upper surfaceof the guide-plate and prevent any further downward movement. A

will at this time result in the removal of the broken chip from thehinge-mortise. Inasmuch as hinge-mortises vary but little in depth,while varying considerably in length cut of the chisels and other bladeson the cutter-head have not been devised. The stops at the endof theblock 7 positively limit the downward movement of the cutter-head whenthe proper depth has been reached, and that having been done no care isnecessary in removing the chip from the mortise, as the hingemortiserrests firmly upon the surface of the work, and a few blows upon thebroad-bladed chisel 14 will remove the chip entirely.

As many door-hinges are of substantially the same size, so that thesame-sized cutterhead may be successfully used to cut them, theadjustments in the device which forms the subject-matter of thisapplication are made as few as possible, and the possibility of anyslipping of movable adjusted parts is thereby prevented.

If desired, several different sizes of the hinge-mortiser of the designabove described may be kept for use in forming mortisers of differentsizes, and, except for mortises of undifficulty will be experienced informing a complete mortise with a very few blows from a mallet.

The principal variation in the dimensions of hinge-mortises is found inthe width thereof, and therefore I have provided an adjustable jgage-bar by means of which the mortiser may be readily adjusted for theformation of whole device may be panying drawings it will be seen thatwith a mortiser constructed in accordance with my invention it will beeasy for an unskilled workman to produce hinge-mortises very rapidly andat the same time to turn out entirely satisfactory work, as the devicemay be brought positively into position over the seat for the mortise,and a few blows with a mallet upon the stem head home and leave themortise in condition to have the chip removed by a few blows upon thebroad-bladed chisel 14, which projects from its ways in the gage-bar ina plane at right angles to theplane of the stem 8.

Having thus described the construction and operation of my invention,what I claim as new, and desire to secure by Letters Patent, is-

The combination in a device of the class described, of a base having arectangular opening therein for the reception of a vertically-movablecutter-head and having transversely-arranged slots for the reception ofadjusting-screws, a gage-bar disposed beneath said base,adjusting-screws mounted in said gage-bar and extending through saidslots, said gage-bar being provided on its upper surface with a channelfor a chisel, and a cutter-head arranged in the rectangular opening inthe base, said cutter-head being provided on either of its sides withmortise-defining chisels and having a plurality of transversechisel-blades arranged at intervals between the mortise-defining chiselsat the ends of the said cutterhead, the cutter-head being also providedat the end with projections forming stops adapted to contact with theupper surface of the base and positively limit the downward movement ofthe cutter-head in the opening provided in the base.

In testimony that 1 claim the foregoing as my own I have hereto aflixedmy signature in the presence of two witnesses.

JAMES W. CARSON.

Witnesses:

GUY L. Sco'rr, EVA Score 8 will drive the cutter-

